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Arabidopsis thaliana

ABSTRACT: Identification of small RNA loci that are synthesized by RNA-dependent RNA polymerases1/2/6

PROVIDER: PRJNA295538 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR2391660.fastq.gz	Fastqsanger.gz
	SRR2391661.fastq.gz	Fastqsanger.gz
	SRR2391662.fastq.gz	Fastqsanger.gz
	SRR2391663.fastq.gz	Fastqsanger.gz
	SRR2391664.fastq.gz	Fastqsanger.gz

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Bisulfite-Seq and RNA-seq in rootstock of Arabidopsis thaliana grafts

Project description:RNA silencing is a mechanism for regulating gene expression at the transcriptional and post-transcriptional levels. Its functions include regulating endogenous gene expression and protecting the cell against viruses and invading transposable elements (TEs). A key component of the mechanism is small RNAs (sRNAs) of 21-24 nucleotides (nt) in length, which direct the silencing machinery in a sequence specific manner to target nucleic acids. sRNAs of 24 nt are involved in methylation of cytosine residues of target loci in three sequence contexts (CG, CHG and CHH), referred to as RNA-directed DNA methylation (RdDM). We previously demonstrated that 24 nt sRNAs are mobile from shoot to root in Arabidopsis thaliana. In this study we demonstrated that methylation of thousands of loci in root tissues is dependent upon mobile sRNAs from the shoot. Furthermore, we found that mobile sRNA-dependent DNA methylation occurs predominantly in non-CG contexts. These findings were made using base-resolution next generation sequencing approaches and genome wide analyses. Specific classes of short TEs are the predominant targets of mobile sRNA-dependent DNA methylation; classes typically found in gene-rich euchromatic regions. Mobile sRNA-regulated genes were also identified. Mechanistically, we demonstrate that mobile sRNA-dependent non-CG methylation is largely independent of the CMT2/3 RdDM pathway but dependent upon the DRM1/DRM2 RdDM pathway. This is in contrast to non-mobile sRNA-dependent DNA methylation, which predominantly depends upon the CMT2/3 RdDM pathway. These data are complementary to the small RNA sequencing data from Arabidopsis root grafts described in Molnar et al (Science, 2010 May 14;328(5980):872-5).

2016-01-04 | E-MTAB-3473 | biostudies-arrayexpress

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